Protocol-Specific Configurations; About Signaling Protocols; About H.323-Specific Configurations - Cisco ATA186-I1 Installation And Configuration Manual

Protocol-Specific Configurations

This chapter contains information on selecting protocols and services for your
system.

About Signaling Protocols

You can select either H.323 or Session Initiation Protocol (SIP) as the operating
signaling protocol for the Cisco ATA 186. Both signaling protocols offer optional
network control servers. With H.323, pre-call and call control services are offered
by a gatekeeper, while in SIP, a proxy server can receive call transaction requests
and return responses on behalf of the Cisco ATA 186.
Some parameters and supplementary services are available with SIP, some are
available only with H.323, and others are available with both protocols.

About H.323-Specific Configurations

The Cisco ATA 186 uses ITU H.323, Version 2 as the default signaling protocol.
When operating in H.323 mode, the Cisco ATA 186 registers with a gatekeeper
to handle call control services. A full registration request (RRQ) is performed at
power-up. In order to let the gatekeeper know it is still on the network, the
Cisco ATA 186 periodically refreshes this registration by sending an abbreviated
RRQ. The value of the GKTimeToLive configuration parameter determines the
period between refreshes, in seconds.
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Cisco ATA 186 Installation and Configuration Guide
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